Combustion Device for a Wind-Resistant Outdoor Burner

ABSTRACT

A combustion device for a wind-resistant outdoor burner includes a housing having a gas mixing chamber with an inlet portion and an outlet portion. A guiding device includes a gas mixing tube, a guiding member, and a diffusing board. The gas mixing tube is connected to the inlet portion and includes a first end located outside of the housing and a second end located in the gas mixing chamber. The guiding member is porous, is mounted in the gas mixing chamber, and is aligned with and spaced from the second end of the gas mixing tube. The diffusing board is connected to the outlet portion and includes a first side, a second side opposite to the first side, and a plurality of vents extending from the first side through the second side and intercommunicated with the gas mixing chamber of the housing.

BACKGROUND OF THE INVENTION

The present invention relates to a combustion device and, more particularly, to a combustion device for a wind-resistant outdoor burner.

U.S. Pat. No. 8,540,509 B1 discloses an indoor-outdoor gas infrared heater having one or more heat level settings. The heater includes a burner having ceramic plaques with a plurality of perforations and raised surfaces tapering into an apex between the perforations and an operating system having a control module electrically connected to a control valve, a power source and an activator for triggering the heater. The control valve has multiple pathways with each pathway supplying gas to the burner at a flow rate for a designated heat level setting. In installation, the combustion surface extends approximately vertically downward to advantageously provide effective downward thermal radiation when used in a suspended state. Staggered ceramic plaques are densely disposed outside of the combustion surface and extend perpendicularly to the combustion surface to serve as protective components to shield from the wind and guiding the air currents, reducing the risks of flame-out or flashback while the combustion surface is subject to wind.

Since combustion requires certain conditions including low-speed supply of a homogenous mixture of consistently supplied air and a gas that has a uniform, proper concentration and that is mixed with the air at a proper ratio to maintain uniform, stable combustion at the surface of the burner. However, currently available hanging-type radiant heaters suffer from flame-out and flashback when the combustion surface is subject to turbulence resulting from a strong wind or a gust. This is because hanging type infrared radiant heaters utilizing the above structure include a parallelepiped burner having a parallelepiped gas mixing chamber with uniform cross sectional areas perpendicular to the flowing direction of the gas/air mixture. When the control module fills the gas/air mixture from a venture inlet pipe into the burner, since the gas mixing chamber has a uniform cross sectional area nor proper baffles are provided in the mixing chamber, a large portion of the gas/air mixture entering the gas mixing chamber via the venture inlet pipe is guided by the inertia of the gas/air mixture and flows directly to an end of a chamber housing of the burner opposite to an inlet pipe of the burner, because the flowing resistance is low and the variation in the backpressure is not small along the flowing direction. When the gas/air mixture reaches the other end adjacent to the gas mixing chamber, the gas mixture is impeded by the boundary of the chamber (which forms a larger backpressure), changes its flowing direction, and then flows out of the burner. The flowing velocity at an end of the burner adjacent to the inlet tube is higher (the pressure is relatively smaller), such that the output amount at an adjacent area of the combustion surface is reduced. Thus, the pressure at the overall combustion surface is not uniform, resulting in non-uniform output of the gas mixture as well as non-uniform combustion.

Furthermore, the burner of the above design is exposed to wind during combustion. Specifically, a low-pressure area adjacent to the inlet tube of the burner cannot resist the wind pressure and, thus, tends to suck ambient air, causing tremendous disturbance and change in the concentration and pressure in the gas mixing chamber, which causes flame-out or even flashback and leads to two immediate dangers: 1. The flame at the surface of the burner is blown out by the wind, but the gas control system cannot immediately detect the flame-out and still supplies gas, leading to accumulation of gas in or around the heater. When the ambient wind becomes smaller or ceases, the heater reignites and causes an instantaneous large-scale flame or even flare-up. 2. The strong wind directly blows into the gas mixing chamber of the burner and pushes the flame into the gas mixing chamber, forming a flashback state, such that the flame directly burning in the gas mixing chamber instead of outside the gas mixing chamber, resulting in instantaneous accumulation of a large quantity of heat in the gas mixing chamber. Thus, the temperature in the burner increases continuously and results in damage to the components and immediate danger.

To solve the drawbacks of the above design, in a currently used approach, the volume of the gas mixing chamber is increased to reduce the pressure difference for solving the non-uniform combustion. Furthermore, a front shield and a flow guiding member are added to the burner to reduce the risk of direct entrance of the ambient air flow, thereby reducing the possibility of flame-out and flashback. However, the effect of such an approach is not obvious. Use of this approach is limited by conditions from a windless state to extremely low-speed wind states. Furthermore, the front shield and the air guiding member are affected by the high temperature resulting from combustion, leading to deformation and accumulation of high heat. The overall structure is complicated, has a large volume, and is difficult to use.

Thus, a need exists for a novel combustion device for a wind-resistant outdoor burner that mitigates or obviates the disadvantages of the prior art.

BRIEF SUMMARY OF THE INVENTION

A combustion device for a wind-resistant outdoor burner according to the present invention includes a housing and a guiding device. The housing includes a gas mixing chamber. The gas mixing chamber includes an outlet portion at a side thereof and an inlet portion at another side thereof. The guiding device includes a gas mixing tube, a guiding member, and a diffusing board. The gas mixing tube is connected to the inlet portion and includes a first end located outside of the housing and a second end opposite to the first end and located in the gas mixing chamber. The guiding member is mounted in the gas mixing chamber and is aligned with the second end of the gas mixing tube. The guiding member is spaced from the second end of the gas mixing tube by a spacing and is porous. The diffusing board is connected to the outlet portion and includes a first side and a second side opposite to the first side. The diffusing board includes a plurality of vents extending from the first side through the second side of the diffusing board. The plurality of vents intercommunicates with the gas mixing chamber of the housing. The combustion device having the above structure achieves an excellent wind-resistant effect and can avoid flame-out and flashback when subjected to strong wind.

In an example, the guiding member extends perpendicularly to a longitudinal direction of the gas mixing tube and is in the form of a mesh having a plurality of holes.

In an example, the plurality of vents of the diffusing board is located in a span of the gas mixing chamber.

In an example, the housing includes a bottom side opposite to outlet portion. A maximum spacing between the outlet portion and the bottom side forms a first depth. A spacing between the outlet portion and the bottom side at an end of the housing opposite to the inlet portion forms a second depth smaller than the first depth.

In an example, the bottom side of the housing includes a planar section and an inclined section. The planar section is adjacent to the inlet portion and has a uniform spacing to the outlet portion. The inclined section is connected to an end of the planar section opposite to the inlet portion. A spacing from the inclined section to the outlet portion gradually decreases from an end of the inclined section adjacent to the inlet portion to another end of the inclined section remote to the inlet portion.

In an example, the housing includes a first sidewall at the inlet portion. The first sidewall has a first through-hole. The housing further includes a second sidewall and a third sidewall respectively on two sides of the first sidewall. The housing further includes a fourth sidewall opposite to the inlet portion. The first sidewall, the second sidewall, the third sidewall, and the fourth sidewall are fixed to the bottom side. The guiding member includes three sides respectively connected to the bottom side, the second sidewall, and the third sidewall and extends from the bottom side to the outlet portion.

In an example, the combustion device further includes an inclined board mounted in the gas mixing chamber. The inclined board includes a first end connected to the bottom side and a second end connected to the first sidewall. The inclined board further includes two opposite sides respectively connected to the second sidewall and the third sidewall. A spacing from the inclined board to the outlet portion gradually increases from the second end of the inclined board to the first end of the inclined board. The inclined board has a second through-hole aligned with the first through-hole. The gas mixing tube extends through the first through-hole and the second through-hole.

In an example, the housing further includes a ledge and an outer frame. The ledge is annular and is fixed to sides of the first sidewall, the second sidewall, the third sidewall, and the fourth sidewall which are opposite to the bottom side. The ledge extends away from the gas mixing chamber. The outer frame is annular and is fixed to an outer side of the ledge. The outer frame extends from the ledge in a direction away from the bottom side. The first side of the diffusing board faces the gas mixing chamber and abuts the ledge. The outer frame surrounds and abuts the diffusing board.

In an example, the combustion device further includes a reinforcing member mounted in the gas mixing chamber. The reinforcing member includes an end fixed to the second sidewall and another end fixed to the third sidewall. A spacing from the reinforcing member to the first sidewall is 0.9-1.1 times a spacing from the reinforcing member to the fourth sidewall.

In an example, the guiding device further includes a first spacer abutting the second side of the diffusing board and extending away from the housing. The first spacer is located in a distribution area of the plurality of vents of the diffusing board. The distribution area of the plurality of vents is divided by the first spacer into two sections.

In an example, the first spacer includes a first end adjacent to the inlet portion and a second end opposite to the inlet portion. The guiding device further includes a plurality of second spacers abutting the second side of the diffusing board and extending away from the housing. The plurality of second spacers is located in the distribution area of the plurality of vents of the diffusing board. The first spacer intersects with each of the plurality of second spacers.

In an example, the guiding device further includes at least one ceramic plate disposed on a side of the diffusing board opposite to the housing. The outer frame surrounds and abuts the diffusing board and the at least one ceramic plate. The at least one ceramic plate includes a plurality of through-holes. Each of the plurality of through-holes extends from a side of the at least one ceramic plate adjacent to the diffusing board to another side of the at least one ceramic plate opposite to the diffusing board. The at least one ceramic plate abuts the first spacer and the plurality of second spacers.

In an example, the at least one ceramic plate includes a plurality of ceramic plates. The plurality of ceramic plates is disposed on the side of the diffusing board opposite to the housing and is arranged from a location adjacent to the inlet portion to another location remote to the inlet portion. The outer frame surrounds and abuts the diffusing board and the plurality of ceramic plates. Each of the plurality of ceramic plates includes the plurality of through-holes extending therethrough. Each of the plurality of ceramic plates abuts the first spacer and the plurality of second spacers.

In an example, the combustion device further includes an igniter mounted in the outlet portion. The igniter is located on a side of one of the plurality of ceramic plates.

In an example, the outlet portion and the inlet portion intercommunicate with the gas mixing chamber. The inlet portion is disposed on a side of the housing contiguous to the inlet portion. The gas mixing chamber of the housing is sealed except at the outlet portion and the inlet portion. The gas mixing tube further includes a neck between the first end and the second end. A cross sectional area of the neck perpendicular to the longitudinal direction of the gas mixing tube is smaller than a cross sectional area of the first end or the second end of the gas mixing tube perpendicular to the longitudinal direction of the gas mixing tube.

The present invention will become clearer in light of the following detailed description of illustrative embodiments of this invention described in connection with the drawings.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a combustion device for a wind-resistant outdoor burner according to the present invention.

FIG. 2 is an exploded, perspective view of the combustion device of FIG. 1.

FIG. 3 is a cross sectional view of the combustion device of FIG. 1.

FIG. 4 is an enlarged view of a larger circled portion of FIG. 3.

FIG. 5 is an enlarged view of a smaller circled portion of FIG. 3.

FIG. 6 is a cross sectional view illustrating use of the combustion device of FIG. 1.

FIG. 7 is an enlarged view of a portion of the combustion device of FIG. 6.

DETAILED DESCRIPTION OF THE INVENTION

With reference to FIGS. 1-7, a combustion device 10 for a wind-resistant outdoor burner according to the present invention includes a housing 20 and a guiding device 30.

The housing 20 includes a gas mixing chamber 21. The gas mixing chamber 21 includes an outlet portion 22 at a side thereof and an inlet portion 23 at another side thereof. The outlet portion 22 and the inlet portion 23 intercommunicate with the gas mixing chamber 21. The inlet portion 23 is disposed on a side of the housing 20 contiguous to the inlet portion 22. The gas mixing chamber 21 of the housing 20 is sealed except at the outlet portion 22 and the inlet portion 23.

The housing 20 includes a bottom side 24 opposite to outlet portion 22. A maximum spacing between the outlet portion 22 and the bottom side 24 forms a first depth D1. A spacing between the outlet portion 22 and the bottom side 24 at an end of the housing 20 opposite to the inlet portion 23 forms a second depth D2 that is smaller than the first depth D1. The bottom side 24 of the housing 20 includes a planar section 241 and an inclined section 242. The planar section 241 is adjacent to the inlet portion 23 and has a uniform spacing to the outlet portion 22. The inclined section 242 is connected to an end of the planar section 241 opposite to the inlet portion 23. A spacing from the inclined section 242 to the outlet portion 22 gradually decreases from an end of the inclined section 242 adjacent to the inlet portion 23 to another end of the inclined section 242 remote to the inlet portion 23.

The housing 20 includes a first sidewall 231 at the inlet portion 23. The first sidewall 231 has a first through-hole 232. The housing 20 further includes a second sidewall 25 and a third sidewall 26 respectively on two sides of the first sidewall 231. The housing 20 further includes a fourth sidewall 27 opposite to the inlet portion 23. The first sidewall 231, the second sidewall 25, the third sidewall 26, and the fourth sidewall 27 are fixed to the bottom side 24.

An inclined board 211 and a reinforcing member 212 are mounted in the gas mixing chamber 21. The inclined board 211 includes a first end connected to the bottom side 24 and a second end connected to the first sidewall 231. The inclined board 211 further includes two opposite sides respectively connected to the second sidewall 25 and the third sidewall 26. A spacing from the inclined board 211 to the outlet portion 22 gradually increases from the second end of the inclined board 211 to the first end of the inclined board 211. The inclined board 211 has a second through-hole 213 aligned with the first through-hole 232. The reinforcing member 212 includes an end fixed to the second sidewall 25 and another end fixed to the third sidewall 26. A spacing from the reinforcing member 212 to the first sidewall 231 is about 0.9-1.1 times a spacing from the reinforcing member 212 to the fourth sidewall 27. In this embodiment, the spacing from the reinforcing member 212 to the first sidewall 231 is equal to the spacing from the reinforcing member 212 to the fourth sidewall 27.

The housing 20 further includes a ledge 221 and an outer frame 222. The ledge 221 is annular and is fixed to sides of the first sidewall 231, the second sidewall 25, the third sidewall 26, and the fourth sidewall 27 which are opposite to the bottom side 24. The ledge 221 extends away from the gas mixing chamber 21. The outer frame 222 is annular and is fixed to an outer side of the ledge 221. The outer frame 222 extends from the ledge 221 in a direction away from the bottom side 24.

The guiding device 30 including a gas mixing tube 31, a guiding member 32, and a diffusing board 33. The gas mixing tube 31 is connected to the inlet portion 23 and extends through the first through-hole 232 and the second through-hole 213. The gas mixing tube 31 includes a first end 311, a second end 312 opposite to the first end 311, and a neck 313 between the first end 311 and the second end 312. The first end 311 is located outside of the housing 20. The second end 312 is located in the gas mixing chamber 21. A cross sectional area of the neck 313 perpendicular to the longitudinal direction of the gas mixing tube 31 is smaller than a cross sectional area of the first end 311 or the second end 312 of the gas mixing tube 31 perpendicular to the longitudinal direction of the gas mixing tube 31.

The guiding member 32 is mounted in the gas mixing chamber 21, is aligned with the second end 312 of the gas mixing tube 31, and extends perpendicularly to the longitudinal direction of the gas mixing tube 31. The guiding member 32 is spaced from the second end 312 of the gas mixing tube 31 by a spacing D and is porous. In this embodiment, the guiding member 32 is in a form of a mesh having a plurality of holes 321. The guiding member 32 includes three sides respectively connected to the bottom side 24, the second sidewall 25, and the third sidewall 26 and extends from the bottom side 24 to the outlet portion 22.

The diffusing board 33 is connected to the outlet portion 22 and includes a first side 331 and a second side 332 opposite to the first side 331. The first side 331 of the diffusing board 331 faces the gas mixing chamber 21 and abuts the ledge 221. The diffusing board 33 includes a plurality of vents 333 extending from the first side 331 through the second side 332 of the diffusing board 33. The plurality of vents 333 intercommunicates with the gas mixing chamber 21 of the housing 20 and is located in a span of the gas mixing chamber 21.

The guiding device 30 further includes a first spacer 34 and a plurality of second spacers 35. The first spacer 34 abuts the second side 332 of the diffusing board 33 and extends away from the housing 20. The first spacer 34 is located in a distribution area of the plurality of vents 333 of the diffusing board 33. The distribution area of the plurality of vents 333 is divided by the first spacer 34 into two sections. The first spacer 34 includes a first end adjacent to the inlet portion 23 and a second end opposite to the inlet portion 23. The plurality of second spacers 35 abuts the second side 332 of the diffusing board 33 and extends away from the housing 20. The plurality of second spacers 35 is located in the distribution area of the plurality of vents 333 of the diffusing board 33. The first spacer 34 intersects with each of the plurality of second spacers 35.

The guiding device 30 further includes at least one ceramic plate 36 disposed on a side of the diffusing board 33 opposite to the housing 20. The outer frame 222 surrounds and abuts the diffusing board 33 and the at least one ceramic plate 36. The at least one ceramic plate 36 includes a plurality of through-holes 361. Each of the plurality of through-holes 361 extends from a side of the at least one ceramic plate 36 adjacent to the diffusing board 33 to another side of the at least one ceramic plate 36 opposite to the diffusing board 33. The at least one ceramic plate 36 abuts the first spacer 34 and the plurality of second spacers 35.

In this embodiment, the combustion device 10 includes a plurality of ceramic plates 36 disposed on the side of the diffusing board 33 opposite to the housing 20 and arranged from a location adjacent to the inlet portion 23 to another location remote to the inlet portion 23. The outer frame 222 surrounds and abuts the diffusing board 33 and the plurality of ceramic plates 36. Each of the plurality of ceramic plates 36 includes the plurality of through-holes 361 extending therethrough. Each of the plurality of ceramic plates 36 abuts the first spacer 34 and the plurality of second spacers 35.

The combustion device 10 further includes an igniter 40 mounted in the outlet portion 22. The igniter 40 is located on a side of one of the plurality of ceramic plates 36 and is configured to ignite a gas.

FIGS. 6 and 7 show use of the combustion device 10 according to the present invention. The combustion device 10 with the above structure has a relatively small volume in comparison with the conventional designs but still permits uniform mixing of air and the gas in the housing 20, which increases the heating efficiency of the combustion and reduces the waste of the gas. Furthermore, an excellent wind-resistant effect can be provided without extra complicated shields and air guiding members. When under strong wind, although no shields are disposed in front of the combustion surface, the flame of the combustion device 10 does not extinguish, nor flashover occurs, significantly increasing use safety of the combustion device 10.

When the combustion device 10 is in use, the gas mixing tube 31 is used to mix air with the gas and delivers the gas/air mixture into the housing 20. The gas mixing tube 31 provides a gas mixing length and permits diffusion of the concentration as well as mixing. When the gas/air mixture enters the housing 20, the porous guiding member is aligned with the second end 312 of the gas mixing tube 31 to provide a proper stopping effect for the gas/air mixture, reducing the flowing inertia of the gas/air mixture. The enhanced diffusion also avoids the gas/air mixture from directly flowing to the distal end of the housing 20. About two thirds (⅔) of the gas/air mixture passes through the guiding member 32, properly diffuses to make the concentration of the gas/air mixture more uniform, and continuously flows away from the gas mixing tube 31. Due to provision of the inclined section 242, the gas mixing chamber 21 becomes narrower in the direction away from the inlet portion 23. Due to reduction in the cross sectional area, a portion of the gas/air mixture passes through the diffusing board 33 and the ceramic plates 36 and flows outward, forming uniform output of the gas/air mixture at the outlets of the ceramic plates 36. Thus, the output of the inlet portion 22 is uniform from a location adjacent to the guiding member 32 through another location remote to the inlet portion 23.

Likewise, the remaining portion of the gas/air mixture blocked by the guiding member 32 flows in the reverse direction due to the back pressure resulting from the blocking. A portion of the gas mixing chamber 21 becomes narrower in the direction away from the guiding member 32 due to provision of the inclined board 211, such that a portion of the remaining portion of the gas/air mixture passes through the diffusing board 33 and the ceramic plates 36 and flows outward, forming uniform output of the gas/air mixture at the outlets of the ceramic plates 36. Thus, the output of the inlet portion 22 is uniform from a location adjacent to the guiding member 32 through another location remote to the inlet portion 23.

Due to the above structure, the output flow amount distribution and the pressure of the gas/air mixture are uniform throughout the outlet portion 22, avoiding creation of areas with gas/air mixture of a smaller flow or a lower pressure. Furthermore, due to provision of the diffusing board 33 and the ceramic plates 36, even though the front surface of the combustion device 10 is subject to wind, the wind is less likely to overcome the pressure at any point of the outlet portion 22 and to enter the combustion device 10. Even if the ambient air enters the porous ceramic plates 36, the areas of the diffusion holes 361 are smaller than the overall area of the diffusing board 33, such that massive entry of the ambient current into the gas mixing chamber 21 behind the diffusing board 33 will not occur, avoiding significant variation in the concentration and the flowing pattern of the gas/air mixture in the gas mixing chamber 21. Furthermore, the combustion device 10 is hung upside down or nearly upside down, the ambient wind flows laterally or nearly laterally to the combustion surface. Due to provision of the first spacer 34 and the plurality of spacers 35, the lateral wind flowing toward the combustion surface will create a positive pressure area and a negative pressure area that counterbalances the positive pressure area. Consequently, the combustion device 10 according to the present invention can effectively resist strong wind and can prevent flashback.

The combustion device 10 can effectively eliminate gaps between the diffusing board 33 and the plurality of ceramic plates 36 by mounting the diffusing board 33 and the plurality of ceramic plates 36 on the ledge 221 and the outer frame 222, assuring that the gas/air mixture can only exit through the through-holes 333 of the diffusing board 33 and the through-holes 361 of the plurality of ceramic plates 36, effectively avoiding leakage while permitting easy assembly.

In view of the foregoing, the combustion device 10 for the wind-resistant outdoor burner according to the present invention includes a housing 20 and a guiding device 30. The housing 20 includes a gas mixing chamber 21. The gas mixing chamber 21 includes an inlet portion 21 at a side thereof and an inlet portion 23 at another side thereof. The guiding device 30 includes a gas mixing tube 31, a guiding member 32, and a diffusion board 33. The gas mixing tube 31 is connected to the inlet portion 23 and includes a first end 311 located outside of the housing 20 and a second end 312 opposite to the first end 311 and located in the gas mixing chamber 21. The guiding member 32 is mounted in the gas mixing chamber 21 and is aligned with the second end 312 of the gas mixing tube 31. The guiding member 32 is spaced from the second end 312 of the gas mixing tube 31 by a spacing D and is porous. The diffusing board 33 is connected to the outlet portion 22 and includes a first side 331 and a second side 332 opposite to the first side 331. The diffusing board 33 includes a plurality of vents 333 extending from the first side 331 through the second side 332 of the diffusing board 33. The plurality of vents 333 intercommunicates with the gas mixing chamber 21 of the housing 20. The combustion device 10 having the above structure achieves an excellent wind-resistant effect and can avoid flame-out and flashback when subjected to strong wind.

Although specific embodiments have been illustrated and described, numerous modifications and variations are still possible without departing from the scope of the invention. The scope of the invention is limited by the accompanying claims. 

1. A combustion device for a wind-resistant outdoor burner comprising: a housing including a gas mixing chamber, wherein the gas mixing chamber includes an outlet portion at a side thereof and an inlet portion at another side thereof; a guiding device including a gas mixing tube, a guiding member, and a diffusing board, wherein the gas mixing tube is connected to the inlet portion and includes a first end located outside of the housing and a second end opposite to the first end and located in the gas mixing chamber, wherein the guiding member is mounted in the gas mixing chamber and is aligned with the second end of the gas mixing tube, wherein the guiding member is spaced from the second end of the gas mixing tube by a spacing and is porous, wherein the diffusing board is connected to the outlet portion and includes a first side and a second side opposite to the first side, wherein the diffusing board includes a plurality of vents extending from the first side through the second side of the diffusing board, and wherein the plurality of vents intercommunicates with the gas mixing chamber of the housing.
 2. The combustion device for the wind-resistant outdoor burner as claimed in claim 1, wherein the guiding member extends perpendicularly to a longitudinal direction of the gas mixing tube and is in a form of a mesh having a plurality of holes.
 3. The combustion device for the wind-resistant outdoor burner as claimed in claim 1, wherein the plurality of vents of the diffusing board is located in a span of the gas mixing chamber.
 4. The combustion device for the wind-resistant outdoor burner as claimed in claim 1, wherein the housing includes a bottom side opposite to outlet portion, wherein a maximum spacing between the outlet portion and the bottom side forms a first depth, wherein a spacing between the outlet portion and the bottom side at an end of the housing opposite to the inlet portion forms a second depth, and wherein the second depth is smaller than the first depth.
 5. The combustion device for the wind-resistant outdoor burner as claimed in claim 4, wherein the bottom side of the housing includes a planar section and an inclined section, wherein the planar section is adjacent to the inlet portion and has a uniform spacing to the outlet portion, wherein the inclined section is connected to an end of the planar section opposite to the inlet portion, and wherein a spacing from the inclined section to the outlet portion gradually decreases from an end of the inclined section adjacent to the inlet portion to another end of the inclined section remote to the inlet portion.
 6. The combustion device for the wind-resistant outdoor burner as claimed in claim 5, wherein the housing includes a first sidewall at the inlet portion, wherein the first sidewall has a first through-hole, wherein the housing further includes a second sidewall and a third sidewall respectively on two sides of the first sidewall, wherein the housing further includes a fourth sidewall opposite to the inlet portion, wherein the first sidewall, the second sidewall, the third sidewall, and the fourth sidewall are fixed to the bottom side, and wherein the guiding member includes three sides respectively connected to the bottom side, the second sidewall, and the third sidewall and extends from the bottom side to the outlet portion.
 7. The combustion device for the wind-resistant outdoor burner as claimed in claim 6, further comprising an inclined board mounted in the gas mixing chamber, wherein the inclined board includes a first end connected to the bottom side and a second end connected to the first sidewall, wherein the inclined board further includes two opposite sides respectively connected to the second sidewall and the third sidewall, wherein a spacing from the inclined board to the outlet portion gradually increases from the second end of the inclined board to the first end of the inclined board, wherein the inclined board has a second through-hole aligned with the first through-hole, and wherein the gas mixing tube extends through the first through-hole and the second through-hole.
 8. The combustion device for the wind-resistant outdoor burner as claimed in claim 7, wherein the housing further includes a ledge and an outer frame, wherein the ledge is annular and is fixed to sides of the first sidewall, the second sidewall, the third sidewall, and the fourth sidewall which are opposite to the bottom side, wherein the ledge extends away from the gas mixing chamber, wherein the outer frame is annular and is fixed to an outer side of the ledge, wherein the outer frame extends from the ledge in a direction away from the bottom side, wherein the first side of the diffusing board faces the gas mixing chamber and abuts the ledge, and wherein the outer frame surrounds and abuts the diffusing board.
 9. The combustion device for the wind-resistant outdoor burner as claimed in claim 7, further comprising a reinforcing member mounted in the gas mixing chamber, wherein the reinforcing member includes an end fixed to the second sidewall and another end fixed to the third sidewall, and wherein a spacing from the reinforcing member to the first sidewall is 0.9-1.1 times a spacing from the reinforcing member to the fourth sidewall.
 10. The combustion device for the wind-resistant outdoor burner as claimed in claim 8, wherein the guiding device further includes a first spacer abutting the second side of the diffusing board and extending away from the housing, wherein the first spacer is located in a distribution area of the plurality of vents of the diffusing board, and wherein the distribution area of the plurality of vents is divided by the first spacer into two sections.
 11. The combustion device for the wind-resistant outdoor burner as claimed in claim 10, wherein the first spacer includes a first end adjacent to the inlet portion and a second end opposite to the inlet portion, wherein the guiding device further includes a plurality of second spacers abutting the second side of the diffusing board and extending away from the housing, wherein the plurality of second spacers is located in the distribution area of the plurality of vents of the diffusing board, and wherein the first spacer intersects with each of the plurality of second spacers.
 12. The combustion device for the wind-resistant outdoor burner as claimed in claim 11, wherein the guiding device further includes at least one ceramic plate disposed on a side of the diffusing board opposite to the housing, wherein the outer frame surrounds and abuts the diffusing board and the at least one ceramic plate, wherein the at least one ceramic plate includes a plurality of through-holes, wherein each of the plurality of through-holes extends from a side of the at least one ceramic plate adjacent to the diffusing board to another side of the at least one ceramic plate opposite to the diffusing board, and wherein the at least one ceramic plate abuts the first spacer and the plurality of second spacers.
 13. The combustion device for the wind-resistant outdoor burner as claimed in claim 12, wherein the at least one ceramic plate includes a plurality of ceramic plates, wherein the plurality of ceramic plates is disposed on the side of the diffusing board opposite to the housing and is arranged from a location adjacent to the inlet portion to another location remote to the inlet portion, wherein the outer frame surrounds and abuts the diffusing board and the plurality of ceramic plates, wherein each of the plurality of ceramic plates includes the plurality of through-holes extending therethrough, and wherein each of the plurality of ceramic plates abuts the first spacer and the plurality of second spacers.
 14. The combustion device for the wind-resistant outdoor burner as claimed in claim 13, further comprising an igniter mounted in the outlet portion, wherein the igniter is located on a side of one of the plurality of ceramic plates.
 15. The combustion device for the wind-resistant outdoor burner as claimed in claim 1, wherein the outlet portion and the inlet portion intercommunicate with the gas mixing chamber, wherein the inlet portion is disposed on a side of the housing contiguous to the outlet portion, wherein the gas mixing chamber of the housing is sealed except at the outlet portion and the inlet portion, wherein the gas mixing tube further includes a neck between the first end and the second end, and wherein a cross sectional area of the neck perpendicular to the longitudinal direction of the gas mixing tube is smaller than a cross sectional area of the first end or the second end of the gas mixing tube perpendicular to the longitudinal direction of the gas mixing tube. 